This International Standard specifies a standard reference test method useful to assess the relative degradation characteristics of cleanable filter media for industrial applications under standardized simulated test conditions. The main purpose of testing is to obtain the information about relative change of properties of filter media due to the exposure to the simulated gas conditions for a long time. Main target of this international standard is placed to the property change of non-woven fabric filter because they are frequently used under similar circumstances with the test gas conditions described in this international standard. The results obtained from this test method are not intended for predicting the absolute properties of full scale filter facilities. However they will be helpful for the design of a bag filter and selection and development of appropriate cleanable filter media, and for the identification of suitable operating parameters.